A machine tool device, in particular circular saw device, includes (i) a clamping unit for fixing a tool, in particular a circular saw blade, (ii) a protective cover, which at least partly surrounds a tool holder region for the tool, (iii) an actuation unit for actuating the clamping unit, and (iv) a guard unit which blocks the actuation unit when the protective cover is at least partly open.

A machine tool device, in particular circular saw device, includes (i) a clamping unit for fixing a tool, in particular a circular saw blade, (ii) a protective cover, which at least partly surrounds a tool holder region for the tool, (iii) an actuation unit for actuating the clamping unit, and (iv) a guard unit which blocks the actuation unit when the protective cover is at least partly open.

A power tool for forming a channel in a work surface includes a first section carrying a rotatable shaft having a shaft axis and a second section that engages the work surface; a cutting disc having a substantially circular blade provided on the rotatable shaft; a first support portion on one side of the cutting disc and a second support portion on the opposite side of the cutting disc which cooperate to hold the cutting disc at an oblique angle relative to the shaft axis. A first locking feature of the first support portion and a second locking feature of the second support portion extend through a circular opening of the cutting disc and cooperate to resist relative rotation of the first and second support portions. The first section is movable relative to the second section to move the cutting disc into and out of engagement with the work surface.

A power tool for forming a channel in a work surface includes a first section carrying a rotatable shaft having a shaft axis and a second section that engages the work surface; a cutting disc having a substantially circular blade provided on the rotatable shaft; a first support portion on one side of the cutting disc and a second support portion on the opposite side of the cutting disc which cooperate to hold the cutting disc at an oblique angle relative to the shaft axis. A first locking feature of the first support portion and a second locking feature of the second support portion extend through a circular opening of the cutting disc and cooperate to resist relative rotation of the first and second support portions. The first section is movable relative to the second section to move the cutting disc into and out of engagement with the work surface.